Spain's interior ministry said Saturday it had arrested in two men suspected of trying to recruit people for Islamic militancy, or "holy war", as well as a woman ready to go to the conflict zone.

The men of Moroccan origin, aged 32 and 42, were arrested in Barcelona, the ministry said in a statement without specifying the date.

They are suspected of having used "different virtual platforms and social media to spread the extremist ideals of Daech (Arab acronym for Islamic State group) and attract followers to send them to the conflict zones," the statement said.

A 24-year-old Spanish woman was arrested in a town northeast of Barcelona who had been radicalised and was ready to leave to join the militant groups, said the ministry, which declined to name what country she was heading for.

Spain has been under a high security alert -- level 4 out of 5 -- since June and has arrested some 95 people in its investigation of suspected militant cells since the start of the year.

The ministry estimates that around 139 people have left Spain to fight in Syria or Iraq and only 25 have returned.

In comparison, French authorities say at least 250 militant fighters have returned to France.